Overview on Solid 4He and the Issue of Supersolidity

Chan, Moses H. W.; Hallock, R. B.; Reatto, L.

doi:10.1007/s10909-013-0882-x

Cited by 78 publications

(87 citation statements)

References 228 publications

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“…Hybrid functionals, however, do not account for the long range part of the correlation hole energy and thus cannot reproduce dispersion forces. Effective ways to correct for these drawbacks have been proposed by several authors (Chai and Head-Gordon, 2008;Lin et al, 2013;Mardirossian and Head-Gordon, 2014). …”

Section: Density Functional Theorymentioning

confidence: 99%

Simulation and understanding of atomic and molecular quantum crystals

2017

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Quantum crystals abound in the whole range of solid-state species. Below a certain threshold temperature the physical behavior of rare gases ( 4 He and Ne), molecular solids (H 2 and CH 4 ), and some ionic (LiH), covalent (graphite), and metallic (Li) crystals can be only explained in terms of quantum nuclear effects (QNE). A detailed comprehension of the nature of quantum solids is critical for achieving progress in a number of fundamental and applied scientific fields like, for instance, planetary sciences, hydrogen storage, nuclear energy, quantum computing, and nanoelectronics. This review describes the current physical understanding of quantum crystals formed by atoms and small molecules, as well as the wide palette of simulation techniques that are used to investigate them. Relevant aspects in these materials such as phase transformations, structural properties, elasticity, crystalline defects and the effects of reduced dimensionality, are discussed thoroughly. An introduction to quantum Monte Carlo techniques, which in the present context are the simulation methods of choice, and other quantum simulation approaches (e. g., path-integral molecular dynamics and quantum thermal baths) is provided. The overarching objective of this article is twofold. First, to clarify in which crystals and physical situations the disregard of QNE may incur in important bias and erroneous interpretations. And second, to promote the study and appreciation of QNE, a topic that traditionally has been treated in the context of condensed matter physics, within the broad and interdisciplinary areas of materials science.

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Section: Density Functional Theorymentioning

confidence: 99%

Simulation and understanding of atomic and molecular quantum crystals

2017

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“…The possible experimental realisation of a supersolid state of matter in bulk solid 4 He has been the subject of intense recent interest [1,2]. In a perfect crystal, supersolidity would rely on the incommensurability of that crystal (spontaneous zero-point vacancies free to tunnel through the crystal) [3].…”

Section: Introductionmentioning

confidence: 99%

On the ‘Supersolid’ Response of the Second Layer of $$^4 \hbox {He}$$ 4 He on Graphite

et al. 2017

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Recent torsional oscillator measurements on the second layer of 4 He adsorbed on graphite have identified an anomalous superfluid response over a coverage range near third-layer promotion, with four distinct coverage regimes. Here, we present details of the superfluid response in the coverage regime immediately below third-layer promotion. A scaling analysis of the inferred superfluid fraction shows the characteristic temperature governing the superfluid response to decrease, approaching zero near the coverage at which simulations predict the second layer to form a conventional incommensurate solid.

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“…[9,21], which is ostensibly caused by the 3 He impurities, is an open and important question. To answer it, one has to take into account the quantum nature of dislocations and consider 3 He atoms as impuritons moving in a very narrow band [30]. It should also be mentioned that, so far, there is no data on the dissipative effects in the syringe effect.…”

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confidence: 99%

Quantum plasticity and supersolid response in helium-4

et al. 2014

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We argue that the three key phenomena recently observed in solid 4 He-mass supertransport, anomalous isochoric compressibility (syringe effect), and giant plasticity-are closely linked to each other through the physics of an interconnected network of tilted quantum-rough dislocations. As immediate implications of this connection several predictions follow: In the absence of 3 He impurities, the syringe effect and giant plasticity persist down to T = 0; the dynamical low-frequency syringe and giant-plasticity responses are dispersionless; and similarly to giant plasticity but without direct relationship to the supertransport along the dislocation cores, 3 He impurities should suppress the syringe effect partially or completely at appropriately low temperatures.

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Overview on Solid 4He and the Issue of Supersolidity

Cited by 78 publications

References 228 publications

Simulation and understanding of atomic and molecular quantum crystals

Simulation and understanding of atomic and molecular quantum crystals

On the ‘Supersolid’ Response of the Second Layer of $$^4 \hbox {He}$$ 4 He on Graphite

Quantum plasticity and supersolid response in helium-4

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